diff --git a/src/Type/Php/SprintfFunctionDynamicReturnTypeExtension.php b/src/Type/Php/SprintfFunctionDynamicReturnTypeExtension.php
index cec300a8da..3f37564e95 100644
--- a/src/Type/Php/SprintfFunctionDynamicReturnTypeExtension.php
+++ b/src/Type/Php/SprintfFunctionDynamicReturnTypeExtension.php
@@ -49,50 +49,56 @@ public function getTypeFromFunctionCall(
 		}
 
 		$formatType = $scope->getType($args[0]->value);
+		if (count($args) === 1) {
+			return $this->getConstantType($args, null, $functionReflection, $scope);
+		}
 
-		if (count($formatType->getConstantStrings()) > 0) {
-			$singlePlaceholderEarlyReturn = null;
-			foreach ($formatType->getConstantStrings() as $constantString) {
-				// The printf format is %[argnum$][flags][width][.precision]
-				if (preg_match('/^%([0-9]*\$)?[0-9]*\.?[0-9]*([sbdeEfFgGhHouxX])$/', $constantString->getValue(), $matches) === 1) {
-					if ($matches[1] !== '') {
-						// invalid positional argument
-						if ($matches[1] === '0$') {
-							return null;
-						}
-						$checkArg = intval(substr($matches[1], 0, -1));
-					} else {
-						$checkArg = 1;
-					}
+		$formatStrings = $formatType->getConstantStrings();
+		if (count($formatStrings) === 0) {
+			return null;
+		}
 
-					// constant string specifies a numbered argument that does not exist
-					if (!array_key_exists($checkArg, $args)) {
+		$singlePlaceholderEarlyReturn = null;
+		foreach ($formatType->getConstantStrings() as $constantString) {
+			// The printf format is %[argnum$][flags][width][.precision]
+			if (preg_match('/^%([0-9]*\$)?[0-9]*\.?[0-9]*([sbdeEfFgGhHouxX])$/', $constantString->getValue(), $matches) === 1) {
+				if ($matches[1] !== '') {
+					// invalid positional argument
+					if ($matches[1] === '0$') {
 						return null;
 					}
+					$checkArg = intval(substr($matches[1], 0, -1));
+				} else {
+					$checkArg = 1;
+				}
 
-					// if the format string is just a placeholder and specified an argument
-					// of stringy type, then the return value will be of the same type
-					$checkArgType = $scope->getType($args[$checkArg]->value);
-
-					if ($matches[2] === 's' && $checkArgType->isString()->yes()) {
-						$singlePlaceholderEarlyReturn = $checkArgType;
-					} elseif ($matches[2] !== 's') {
-						$singlePlaceholderEarlyReturn = new IntersectionType([
-							new StringType(),
-							new AccessoryNumericStringType(),
-						]);
-					}
+				// constant string specifies a numbered argument that does not exist
+				if (!array_key_exists($checkArg, $args)) {
+					return null;
+				}
 
-					continue;
+				// if the format string is just a placeholder and specified an argument
+				// of stringy type, then the return value will be of the same type
+				$checkArgType = $scope->getType($args[$checkArg]->value);
+
+				if ($matches[2] === 's' && $checkArgType->isString()->yes()) {
+					$singlePlaceholderEarlyReturn = $checkArgType;
+				} elseif ($matches[2] !== 's') {
+					$singlePlaceholderEarlyReturn = new IntersectionType([
+						new StringType(),
+						new AccessoryNumericStringType(),
+					]);
 				}
 
-				$singlePlaceholderEarlyReturn = null;
-				break;
+				continue;
 			}
 
-			if ($singlePlaceholderEarlyReturn !== null) {
-				return $singlePlaceholderEarlyReturn;
-			}
+			$singlePlaceholderEarlyReturn = null;
+			break;
+		}
+
+		if ($singlePlaceholderEarlyReturn !== null) {
+			return $singlePlaceholderEarlyReturn;
 		}
 
 		if ($formatType->isNonFalsyString()->yes()) {
@@ -115,11 +121,15 @@ public function getTypeFromFunctionCall(
 	/**
 	 * @param Arg[] $args
 	 */
-	private function getConstantType(array $args, Type $fallbackReturnType, FunctionReflection $functionReflection, Scope $scope): Type
+	private function getConstantType(array $args, ?Type $fallbackReturnType, FunctionReflection $functionReflection, Scope $scope): ?Type
 	{
 		$values = [];
 		$combinationsCount = 1;
 		foreach ($args as $arg) {
+			if ($arg->unpack) {
+				return $fallbackReturnType;
+			}
+
 			$argType = $scope->getType($arg->value);
 			$constantScalarValues = $argType->getConstantScalarValues();
 
diff --git a/tests/PHPStan/Analyser/nsrt/non-empty-string.php b/tests/PHPStan/Analyser/nsrt/non-empty-string.php
index 60a7b9ec93..55bb8ad77c 100644
--- a/tests/PHPStan/Analyser/nsrt/non-empty-string.php
+++ b/tests/PHPStan/Analyser/nsrt/non-empty-string.php
@@ -349,9 +349,9 @@ public function doFoo(string $s, string $nonEmpty, int $i, bool $bool, $constUni
 		assertType('non-empty-string', preg_quote($nonEmpty));
 
 		assertType('string', sprintf($s));
-		assertType('non-empty-string', sprintf($nonEmpty));
+		assertType('string', sprintf($nonEmpty));
 		assertType('string', vsprintf($s, []));
-		assertType('non-empty-string', vsprintf($nonEmpty, []));
+		assertType('string', vsprintf($nonEmpty, []));
 
 		assertType('0', strlen(''));
 		assertType('5', strlen('hallo'));
diff --git a/tests/PHPStan/Analyser/nsrt/non-falsy-string.php b/tests/PHPStan/Analyser/nsrt/non-falsy-string.php
index ebe223f864..fa1f1c16ed 100644
--- a/tests/PHPStan/Analyser/nsrt/non-falsy-string.php
+++ b/tests/PHPStan/Analyser/nsrt/non-falsy-string.php
@@ -74,7 +74,7 @@ function concat(string $s, string $nonFalsey, $numericS, $nonEmpty, $literalStri
 	 * @param non-empty-array<non-falsy-string> $arrayOfNonFalsey
 	 * @param non-empty-array $nonEmptyArray
 	 */
-	function stringFunctions(string $s, $nonFalsey, $arrayOfNonFalsey, $nonEmptyArray)
+	function stringFunctions(string $s, $nonFalsey, $arrayOfNonFalsey, $nonEmptyArray, array $arr)
 	{
 		assertType('string', implode($nonFalsey, []));
 		assertType('non-falsy-string', implode($nonFalsey, $nonEmptyArray));
@@ -104,8 +104,15 @@ function stringFunctions(string $s, $nonFalsey, $arrayOfNonFalsey, $nonEmptyArra
 
 		assertType('non-falsy-string', preg_quote($nonFalsey));
 
-		assertType('non-falsy-string', sprintf($nonFalsey));
-		assertType('non-falsy-string', vsprintf($nonFalsey, []));
+		assertType('string', sprintf($nonFalsey));
+		assertType("'foo'", sprintf('foo'));
+		assertType("string", sprintf(...$arr));
+		assertType("non-falsy-string", sprintf('%s', ...$arr)); // should be 'string'
+		assertType('string', vsprintf($nonFalsey, []));
+		assertType('string', vsprintf($nonFalsey, []));
+		assertType("non-falsy-string", vsprintf('foo', [])); // should be 'foo'
+		assertType("non-falsy-string", vsprintf('%s', ...$arr)); // should be 'string'
+		assertType("string", vsprintf(...$arr));
 
 		assertType('int<1, max>', strlen($nonFalsey));
 
diff --git a/tests/PHPStan/Analyser/nsrt/printf-errors-php8.php b/tests/PHPStan/Analyser/nsrt/printf-errors-php8.php
new file mode 100644
index 0000000000..872332b073
--- /dev/null
+++ b/tests/PHPStan/Analyser/nsrt/printf-errors-php8.php
@@ -0,0 +1,11 @@
+<?php // lint >= 8.0
+
+namespace PrintFErrorsPhp8;
+
+use function PHPStan\Testing\assertType;
+
+function doFoo()
+{
+	assertType("string", sprintf('%s')); // error
+	assertType("string", vsprintf('%s')); // error
+}